When S is present instead of s+, along with Co and Db, and Aph, we see brassy silver laced with the palest area being the pheomelanin of the breast, while the rest of the pheomelanic areas are a cream to pale yellow. To secure the cleanest white in silver laced varieties, Aph^I must be present and homozygous, whether Db is present or not.

It seems he is going by phaeomelanin phenotypes only (not considering all specific mutation traits), as he also said that Db was in laced Wyandottes, that RIR were Db, not Co (some exceptions), misrepresents many of the traits of Di (no mention that it is a partial eumelanin restrictor, dilutes dermal leg pigment, etc), Mh, & so on...

So I find it very hard going reading his articles. I wish he would stick to hard data results, as he would have a wealth of information at hand from breeding these long-tails.